Johannes Geyer <[email protected]>:
Rather I would say that logical statements evaluate all missings as
true, comparisons regard . as positive infinity (and extended missings
as "bigger" infinities), various sum and total style functions regard
missing as zero, and most other operations regard missing as undefined
and therefore propagate . through to the final calculation.
On Jan 10, 2008 10:28 AM, Johannes Geyer <[email protected]> wrote:
> it is not -gen-, -sum- nor -egen- it is the -if- that does not ignore
> missing values but interprets them as numbers.
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